<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品参数</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 警告信息提示区域 -->
      <el-alert
        title="注意：只允许为第三级分类设置相关参数！"
        type="warning"
        :closable="false"
        show-icon>
      </el-alert>
      <!-- 选择商品分类区域 -->
      <el-row class="cat_opt">
          <el-col>
            <span>选择商品分类：</span>
            <!-- 选择商品分类的级联选择器 -->
            <el-cascader
            expand-trigger="hover"
              v-model="selectedCateKeys"
              :options="catelist"
              :props="cateProps"
              @change="handleChange">
            </el-cascader>
          </el-col>
        </el-row>
        <!-- tab页签区域 -->
        <el-tabs v-model="activeName" @tab-click="handleTabClick">
          <!-- 添加参数按钮 -->
        <el-tab-pane label="动态参数" name="many">
          <el-button type="primary" size="mini" :disabled="selectedCateKeys.length === 0"  @click="addDialogVisible = true">添加参数</el-button>
          <!-- 动态参数表格 -->
          <el-table :data="manyTabName" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">{{ item }}</el-tag>
                <!-- 输入的文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)">
                  </el-input>
                  <!-- 添加按钮 -->
                  <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index" label="#"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!-- 添加静态属性面板 -->
        <el-tab-pane label="静态参数" name="only">
          <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加属性</el-button>
          <!-- 静态属性表格 -->
          <el-table :data="onlyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">{{ item }}</el-tag>
                <!-- 输入的文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)">
                  </el-input>
                  <!-- 添加按钮 -->
                  <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index" label="#"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>

    <!-- 添加参数对话框 -->
    <el-dialog
      :title="'添加' + titleText"
      :visible.sync="addDialogVisible"
      width="50%"
      @close="addDialogClosed">
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" class="demo-ruleForm">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
      <el-button @click="addDialogVisible = false">取 消</el-button>
      <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 修改参数对话框 -->
    <!-- 添加参数对话框 -->
    <el-dialog
      :title="'修改' + titleText"
      :visible.sync="editDialogVisible"
      width="50%"
      @close="editDialogClosed">
      <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px" class="demo-ruleForm">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
      <el-button @click="editDialogVisible = false">取 消</el-button>
      <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
  
</template>

<script>
export default {
  data() {
    return {
      // 商品分类列表
      catelist:[],
      // 级联选择框配置对象
      cateProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      // 级联选择框双向绑定到的数组
      selectedCateKeys:[],
      // 被激活的页签的名称
      activeName: 'many',
      // 这是动态参数的数据
      manyTabName: [],
      // 这是静态参数的数据
      onlyTableData: [],
      // 控制添加对话框的显示与隐藏
      addDialogVisible: false,
      // 添加参数的表单数据对象
      addForm:{
        attr_name: ''
      },
      // 添加参数的表单数据验证规则对象
      addFormRules:{
        attr_name:[
          {required:true, message: '请输入参数名称', trigger: 'blur'}
        ]
      },
      // 添加参数对话框关闭
      editDialogVisible:false,
      // 添加参数数据对象
      editForm:{},
      // 添加参数数据验证规则对象
      editFormRules:{
        attr_name:[
          {required:true, message: '请输入参数名称', trigger: 'blur'}
        ]
      },
    }
  },
  created(){
    this.getCateList()
  },
  methods:{
    async getCateList() {
      const {data:res} = await this.$http.get('categories')
      if(res.meta.status != 200) {
        return this.$message.error('获取商品分类失败！')
      }
      this.catelist = res.data
      console.log(this.catelist);
    },
    // 级联选择框选中项变化，会触发这个函数
    async handleChange() {
      this.getParamsData()
    },
    // tab页签点击事件处理函数
    handleTabClick() {
      // console.log(this.activeName);
      this.handleChange()
    },
    // 获取到的参数列表
    async getParamsData() {
      // 证明选中的不是三级分类
      if (this.selectedCateKeys.length !==3) {
        this.selectedCateKeys = []
        this.manyTabName = []
        this.onlyTableData = []
        return
      }
      // 证明选中的是三级分类
      console.log(this.selectedCateKeys);
      const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{
        params: {sel:this.activeName}
      })
      if(res.meta.status !== 200) {
        return this.$message.error('获取参数列表失败')
      }
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(',') : []
        // 控制文本框的显示与隐藏
        item.inputVisible = false
        // 文本框输入的值
        item.inputValue = ''
      })
      console.log(res.data);
      if(this.activeName === 'many') {
        this.manyTabName = res.data
      }else {
        this.onlyTableData = res.data
      }
    },
    // 监听对话框关闭事件
    addDialogClosed() {
        this.$refs.addFormRef.resetFields()
      },
    // 点击确定添加参数
    addParams() {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return
         const {data:res} = await this.$http.post(`categories/${this.cateId}/attributes`,{
          attr_name: this.addForm.attr_name,
          attr_sel: this.activeName
         })
        if (res.meta.status !== 201) {
          return this.$message.error('添加参数失败！')
        }
        this.$message.success('添加参数成功！')
        this.addDialogVisible = false
        this.getParamsData()
      })
    },
    // 点击按钮展示对话框
    async showEditDialog(attr_id) {
      // 查询当前参数的信息
      const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,{
        params: {
          attr_sel: this.activeName
        }
      })
      if(res.meta.status !== 200) {
        return this.$message.error('获取参数信息失败')
      }
      this.editForm = res.data
      this.editDialogVisible = true
    },
    // 点击关闭编辑清空对话框数据
    editDialogClosed() {
      this.$refs.editFormRef.resetFields()
    },
    // 点击提交确定编辑
    editParams() {
      this.$refs.editFormRef.validate(async valid => {
        if(!valid) return
        const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,{
          attr_name:this.editForm.attr_name,
          attr_sel: this.activeName
        })
        if(res.meta.status !== 200) {
          return this.$message.error('修改参数失败！')
        }
        this.$message.success('修改参数成功')
        this.getParamsData()
        this.editDialogVisible = false
      })
    },
    // 根据Id删除对应项
    async removeParams(attr_id) {
      const confirmResult = await this.$confirm('此操作将永久删除该用户, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).catch(err => err)
      // 用户取消删除参数操作
      if(confirmResult !== 'confirm') {
        return this.$message.info('取消了删除参数')
      }
      // 删除操作业务逻辑
      const {data:res} = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
      if(res.meta.status !== 200) {
        return this.$message.error('删除参数成功')
      }
      this.$message.success('删除参数成功')
      this.getParamsData()
    },
    // 文本输入框失去焦点，或按下了enter都会触发
    async handleInputConfirm(row) {
      if (row.inputValue.trim().length === 0) {
        row.inputValue = '',
        row.inputVisible = false
        return
      }
      // 如果没有return出去，则证明输入的内容需要做后续处理
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      // 需要发起请求，保存修改参数
      this.saveAttrVals(row)
    },
    // 添加参数及清空
    showInput(row) {
      row.inputVisible = true
        this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus();
      });
    },
    // 将对attr_vals的操作保存到数据库
    async saveAttrVals(row) {
      const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{
        attr_name:row.attr_name,
        attr_sel:row.attr_sel,
        attr_vals: row.attr_vals.join(',')
      })
      if(res.meta.status !== 200) {
        return this.$message.error('修改参数失败！')
      }
      this.$message.success('修改参数成功！')
    },
    // 删除对应的参数和选项
    handleClose(i, row) {
      row.attr_vals.splice(i,1)
      this.saveAttrVals(row)
    }
  },
  // 计算属性
  computed: {
    // 如果按钮需要被禁用，则返回true，否则返回 false
    isBtnDisabled() {
      if(this.selectedCateKeys.length !== 3) {
        return true
      }
      return false
    },
    // 当前选中的三级分类的ID
    cateId() {
      if(this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[2]
      }
      return null
    },
    // 动态计算标题的文本
    titleText() {
      if (this.activeName === 'many') {
        return '动态参数'
      }
      return '静态属性'
    }
  }
}
</script>

<style lang="less" scoped>
  .cat_opt {
    margin: 18px 0;
  }
  .el-tag {
    margin: 10px;
  }
  .input-new-tag {
    width: 120px;
  }
</style>